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Community Structure in Social and Biological Networks

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  • Michelle Girvan
  • M. E. J. Newman
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    Abstract

    A number of recent studies have focused on the statistical properties of networked systems such as social networks and the World-Wide Web. Researchers have concentrated particularly on a few properties which seem to be common to many networks: the small-world property, power-law degree distributions, and network transitivity. In this paper, we highlight another property which is found in many networks, the property of community structure, in which network nodes are joined together in tightly-knit groups between which there are only looser connections. We propose a new method for detecting such communities, built around the idea of using centrality indices to find community boundaries. We test our method on computer generated and real-world graphs whose community structure is already known, and find that it detects this known structure with high sensitivity and reliability. We also apply the method to two networks whose community structure is not well-known - a collaboration network and a food web - and find that it detects significant and informative community divisions in both cases.

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    Bibliographic Info

    Paper provided by Santa Fe Institute in its series Working Papers with number 01-12-077.

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    Date of creation: Dec 2001
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    Handle: RePEc:wop:safiwp:01-12-077

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    Related research

    Keywords: Networks; community; social networks; biological networks; food web; collaboration; graph theory;

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